Quantum walks of correlated photons in non-Hermitian photonic lattices,Physical Review B

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Quantum walks of correlated photons in non-Hermitian photonic lattices
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevb.110.094308
Mingyuan Gao ₁ , Chong Sheng _{1,

2} , Yule Zhao ₁ , Runqiu He ₁ , Liangliang Lu ₃ , Wei Chen ₁ , Kun Ding ₄ , Shining Zhu ₁ , Hui Liu ₁

Affiliation

Entanglement entropy characterizes the correlation of multiparticles and unveils the crucial features of open quantum systems. However, the experimental realization of exploring entanglement in non-Hermitian systems remains a challenge. In parallel, quantum walks have offered the possibility of studying the underlying mechanisms of non-Hermitian physics, which includes exceptional points, the non-Hermitian skin effect, and non-Bloch phase transitions. Unfortunately, these studies have only involved and prevailingly focused on the behavior of a single particle. Here, we propose and experimentally realize quantum walks of two indistinguishable photons in engineered non-Hermitian photonic lattices. We have successfully observed the unidirectional behavior of quantum walks in the bulk far from the edges induced by the skin effect. Moreover, we experimentally reveal the suppression of entanglement that is caused by the skin effect in non-Hermitian systems. Our study may facilitate a deep understanding of entanglement in open quantum many-body systems that are far from thermal equilibrium.

中文翻译：

非厄米光子晶格中相关光子的量子行走

纠缠熵表征了多粒子的相关性，揭示了开放量子系统的关键特征。然而，探索非厄米系统中纠缠的实验实现仍然是一个挑战。与此同时，量子行走提供了研究非厄米物理学的基本机制的可能性，其中包括异常点、非厄米集肤效应和非布洛赫相变。不幸的是，这些研究仅涉及并普遍关注单个粒子的行为。在这里，我们提出并通过实验实现了工程非厄米光子晶格中两个不可区分的光子的量子行走。我们已经成功地观察到远离集肤效应引起的边缘的量子行走的单向行为。此外，我们通过实验揭示了非厄米系统中趋肤效应引起的纠缠的抑制。我们的研究可能有助于深入理解远离热平衡的开放量子多体系统中的纠缠。

更新日期：2024-09-09

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